EP 0034466 A1 19810826 - Transmission systems for transmitting signals over power distribution networks, and transmitters and receivers for use therein.
Title (en)
Transmission systems for transmitting signals over power distribution networks, and transmitters and receivers for use therein.
Title (de)
Übertragungssysteme zur Signalübertragung über Energieverteilungsnetze sowie Sender und Empfänger hierfür.
Title (fr)
Systèmes de transmission pour transmettre des signaux à travers des réseaux de distribution à puissance et transmetteurs et récepteurs à cet effet.
Publication
Application
Priority
GB 8005454 A 19800218
Abstract (en)
System for transmitting digital-signals over an electrical power distribution circuit by the same modulating at least two different carrier signals. The carrier signals are derived by frequency division from a common master oscillator, and are thus phase-coherent. The system includes a receiver, comprising a respective input circuit for each modulated carrier. A plurality of oscillator signals of different frequencies, derived from a variable frequency oscillator, are used to beat the received carrier signals to respective signals at a common frequency, which signals are summed. This signal is applied to one input of a phase detector, whose other input is connected to receive another common frequency signal from the variable frequency oscillator. The output signal from the phase detector is applied to the variable frequency oscillator to lock its frequency to those of all the carriers and therefore to that of the master oscillator in the transmitter.
IPC 1-7
IPC 8 full level
H02J 13/00 (2006.01); H04B 3/54 (2006.01)
CPC (source: EP US)
H02J 13/00009 (2020.01 - EP US); H02J 13/00034 (2020.01 - EP); H04B 3/542 (2013.01 - EP US); H04B 2203/5416 (2013.01 - EP US); H04B 2203/5425 (2013.01 - EP US); H04B 2203/5433 (2013.01 - EP US); H04B 2203/5441 (2013.01 - EP US); H04B 2203/5483 (2013.01 - EP US); H04B 2203/5487 (2013.01 - EP US); Y02E 60/00 (2013.01 - EP US); Y04S 40/121 (2013.01 - EP US)
Citation (search report)
- GB 820129 A 19590916 - LANDIS & GYR AG
- GB 824364 A 19591125 - LANDIS & GYR AG
- DE 2531837 A1 19760129 - LITTLE INC A
Designated contracting state (EPC)
AT BE CH DE FR GB IT LI NL SE
DOCDB simple family (publication)
EP 0034466 A1 19810826; AU 6729481 A 19810827; BR 8100947 A 19810825; GB 2070396 A 19810903; GB 2070396 B 19841010; JP S56134850 A 19811021; NZ 196231 A 19850430; US 4419758 A 19831206; ZA 81878 B 19820224
DOCDB simple family (application)
EP 81300570 A 19810212; AU 6729481 A 19810213; BR 8100947 A 19810217; GB 8104776 A 19810216; JP 2245781 A 19810218; NZ 19623181 A 19810210; US 23527781 A 19810217; ZA 81878 A 19810210